SPECT locates areas of the heart muscle that have inadequate blood flow
compared with areas that have normal flow. Inadequate blood flow may mean that
coronary arteries are narrowed or that a heart attack has occurred.

It is a noninvasive imaging scan that exposes you to radiation. For this test, your doctor injects a tiny amount of radioactive
tracers through a vein in your arm. After the radioactive tracer is injected, a
camera that can detect the radiation emitted by these tracers rotates around
you. This creates images of your heart from different angles. Then, computer
graphics are used to create three-dimensional images of your heart.

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